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I have an opportunity to acquire a SuperTrapp 2-1, the headers p/n is 050-7020 (the number 35307 appears below that p/n) and the megaphone body p/n is 027-7144. Will this fit my 2006 XL1200R?

That was for a Thunder Mountain Spitfire, a sportster motor with a right side drive.
The pipe would physically fit your motor, but because it was made for the right side drive wide tire it will stick out so far that you wouldn't be able to put your foot on the peg or use the brake pedal.
So-NO, it will not work.

Ebay or used stuff is usually a head ache!

If you are looking for a cost effective option, we do make a private label black Kerker system for Lowbrow Customs that retails for 399. Available exclusively from them.